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1 Answer
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@t tags. You can append your message with "@t" then list tags (comma separated). These will be appended as hashtags on networks that support hashtagging, or as tags on networks that support tagging. The tags used with @t will not be displayed on any other networks.

Example: Posting "I am posting tags to Ping.fm @t posting, tags" would tell Ping.fm to take the words after the "@t" delimiter and post them throughout your networks. Again, for sites like Twitter that support hashtagging, the tags you include will be superimposed in the message you post. So, posting this message would show up like "I am #posting #tags to Ping.fm" on Twitter et. al and for the other sites it would show up like "I am posting tags to Ping.fm" and the supplied tags would be included wherever they are posted normally.